Numbers k such that R_k + 60 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
A256760
Numbers k such that R_k + 60 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =5a(4) =8a(5) =17a(6) =19a(7) =64a(8) =368a(9) =616a(10) =857a(11) =4351a(12) =6526a(13) =10555a(14) =12685a(15) =14549a(16) =33886
External references
- oeis: A256760